Katana Owners Club U.K.

I'm after a bit of advice. I've a 1982 GSX1100s frame and motor with V5 that I've been offered money for. Motor hasn't run for 25+ years but was good when it last did. There's nothing else i.e. no forks, loom, carbs, etc. I don't want to give it away but also I want to be realistic. Any ideas what I should accept? (Ballpark is fine)

Thanks very much